I won't reword the attorney's words, nor copy an answer from Answer.com. But, I might suggest, if the account number is a 'starting place' for you, wait until her first bank statement comes in the mail. I suspect if has been near thirty days, a statement has or will shortly be coming and while it won't let you access her account, it will most assuredly have her account number on it.

My condolences on the loss of your wife.